lib/mnit/opengles1.nit

   1 # This file is part of NIT ( http://www.nitlanguage.org ).
   2 #
   3 # Copyright 2011-2013 Alexis Laferrière <alexis.laf@xymus.net>
   4 #
   5 # Licensed under the Apache License, Version 2.0 (the "License");
   6 # you may not use this file except in compliance with the License.
   7 # You may obtain a copy of the License at
   8 #
   9 #     http://www.apache.org/licenses/LICENSE-2.0
  10 #
  11 # Unless required by applicable law or agreed to in writing, software
  12 # distributed under the License is distributed on an "AS IS" BASIS,
  13 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14 # See the License for the specific language governing permissions and
  15 # limitations under the License.
  16
  17 # OpenGL ES1 general support (most of it)
  18 module opengles1 is pkgconfig("glesv1_cm", "egl")
  19
  20 import mnit_display
  21
  22 in "C header" `{
  23         #include <EGL/egl.h>
  24         #include <GLES/gl.h>
  25
  26         EGLDisplay mnit_display;
  27         EGLSurface mnit_surface;
  28         EGLContext mnit_context;
  29         EGLConfig mnit_config;
  30         int32_t mnit_width;
  31         int32_t mnit_height;
  32
  33         struct mnit_opengles_Texture {
  34                 GLuint texture;
  35
  36                 /* offsets on source texture */
  37                 float src_xo, src_yo, src_xi, src_yi;
  38
  39                 /* destination width and height */
  40                 int width, height;
  41
  42                 /* may vary depending on scaling */
  43                 int center_x, center_y;
  44
  45                 float scale;
  46                 int blended;
  47         };
  48
  49         struct mnit_opengles_DrawableTexture {
  50                 struct mnit_opengles_Texture super;
  51                 GLuint fbo;
  52                 GLuint depth;
  53                 GLuint color;
  54         };
  55
  56         GLenum mnit_opengles_error_code;
  57
  58         struct mnit_opengles_Texture *mnit_opengles_load_image( const uint_least32_t *pixels, int width, int height, int has_alpha );
  59 `}
  60
  61 in "C" `{
  62         extern NativeWindowType mnit_window;
  63         extern EGLNativeDisplayType mnit_native_display;
  64
  65         GLfloat mnit_opengles_vertices[6][3] =
  66         {
  67                 {0.0f, 1.0f, 0.0f},
  68                 {1.0f, 1.0f, 0.0f},
  69                 {0.0f, 0.0f, 0.0f},
  70                 {1.0f, 0.0f, 0.0f},
  71         };
  72         GLfloat mnit_opengles_texture[6][2] =
  73         {
  74                 {0.0f, 0.0f},
  75                 {0.0f, 1.0f},
  76                 {1.0f, 1.0f},
  77                 {0.0f, 0.0f},
  78                 {1.0f, 1.0f},
  79                 {1.0f, 0.0f}
  80         };
  81
  82         struct mnit_opengles_Texture *mnit_opengles_load_image( const uint_least32_t *pixels, int width, int height, int has_alpha )
  83         {
  84                 struct mnit_opengles_Texture *image = malloc(sizeof(struct mnit_opengles_Texture));
  85                 int format = has_alpha? GL_RGBA: GL_RGB;
  86
  87                 image->width = width;
  88                 image->height = height;
  89                 image->center_x = width/2;
  90                 image->center_y = height/2;
  91                 image->scale = 1.0f;
  92                 image->blended = has_alpha;
  93
  94                 image->src_xo = 0;
  95                 image->src_yo = 0;
  96                 image->src_xi = 1.0;
  97                 image->src_yi = 1.0;
  98
  99                 if ((mnit_opengles_error_code = glGetError()) != GL_NO_ERROR) {
 100                         PRINT_ERROR("error loading image after malloc: %i", mnit_opengles_error_code);
 101                 }
 102
 103                 glGenTextures(1, &image->texture);
 104
 105                 if ((mnit_opengles_error_code = glGetError()) != GL_NO_ERROR) {
 106                         PRINT_ERROR("error loading image after glGenTextures: %i", mnit_opengles_error_code);
 107                 }
 108
 109                 glBindTexture(GL_TEXTURE_2D, image->texture);
 110
 111                 if ((mnit_opengles_error_code = glGetError()) != GL_NO_ERROR) {
 112                         PRINT_ERROR("error loading image glBindTexture: %i", mnit_opengles_error_code);
 113                 }
 114
 115                 glTexImage2D(   GL_TEXTURE_2D, 0, format, width, height,
 116                                                 0, format, GL_UNSIGNED_BYTE, (GLvoid*)pixels);
 117
 118                 if ((mnit_opengles_error_code = glGetError()) != GL_NO_ERROR) {
 119                         PRINT_ERROR("error loading image after glTexImage2D: %i", mnit_opengles_error_code);
 120                 }
 121
 122                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 123
 124                 if ((mnit_opengles_error_code = glGetError()) != GL_NO_ERROR) {
 125                         PRINT_ERROR("error loading image after gtTexParameter: %i", mnit_opengles_error_code);
 126                 }
 127
 128                 return image;
 129         }
 130 `}
 131
 132 # OpenGL ES1 display
 133 # Uses 3d hardware optimization
 134 class Opengles1Display
 135         super Display
 136
 137         redef type I: Opengles1Image
 138
 139         init do extern_init
 140         fun midway_init( format: Int ) do end
 141         fun extern_init: Bool is extern import midway_init `{
 142                 /* initialize OpenGL ES and EGL */
 143                 const EGLint attribs[] = {
 144                                 EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
 145                                 EGL_BLUE_SIZE, 8,
 146                                 EGL_GREEN_SIZE, 8,
 147                                 EGL_RED_SIZE, 8,
 148                                 EGL_NONE
 149                 };
 150                 EGLint w, h, dummy, format;
 151                 EGLint numConfigs;
 152                 EGLConfig config;
 153                 EGLSurface surface;
 154                 EGLContext context;
 155
 156                 EGLDisplay display = eglGetDisplay(mnit_native_display);
 157                 if ( display == EGL_NO_DISPLAY) {
 158                         PRINT_ERROR("Unable to eglGetDisplay");
 159                         return -1;
 160                 }
 161
 162                 if ( eglInitialize(display, 0, 0) == EGL_FALSE) {
 163                         PRINT_ERROR("Unable to eglInitialize");
 164                         return -1;
 165                 }
 166
 167                 if ( eglChooseConfig(display, attribs, &config, 1, &numConfigs) == EGL_FALSE) {
 168                         PRINT_ERROR("Unable to eglChooseConfig");
 169                         return -1;
 170                 }
 171
 172                 if ( numConfigs == 0 ) {
 173                         PRINT_ERROR("No configs available for egl");
 174                         return -1;
 175                 }
 176
 177                 if ( eglGetConfigAttrib(display, config, EGL_NATIVE_VISUAL_ID, &format) == EGL_FALSE) {
 178                         PRINT_ERROR("Unable to eglGetConfigAttrib");
 179                         return -1;
 180                 }
 181
 182                 /* Used by Android to set buffer geometry */
 183                 Opengles1Display_midway_init(recv, format);
 184
 185                 surface = eglCreateWindowSurface(display, config, mnit_window, NULL);
 186                 context = eglCreateContext(display, config, NULL, NULL);
 187
 188                 if (eglMakeCurrent(display, surface, surface, context) == EGL_FALSE) {
 189                         PRINT_ERROR("Unable to eglMakeCurrent");
 190                         return -1;
 191                 }
 192
 193                 eglQuerySurface(display, surface, EGL_WIDTH, &w);
 194                 eglQuerySurface(display, surface, EGL_HEIGHT, &h);
 195
 196                 mnit_display = display;
 197                 mnit_context = context;
 198                 mnit_surface = surface;
 199                 mnit_config = config;
 200                 mnit_width = w;
 201                 mnit_height = h;
 202
 203                 glViewport(0, 0, mnit_width, mnit_height);
 204                 glMatrixMode(GL_PROJECTION);
 205                 glLoadIdentity();
 206                 glOrthof(0.0f, w, h, 0.0f, 0.0f, 1.0f);
 207                 glMatrixMode(GL_MODELVIEW);
 208
 209                 glFrontFace( GL_CW );
 210
 211                 return 0;
 212         `}
 213
 214         fun close is extern `{
 215                 if ( mnit_display != EGL_NO_DISPLAY) {
 216                         eglMakeCurrent( mnit_display, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
 217                         if ( mnit_context != EGL_NO_CONTEXT) {
 218                                 eglDestroyContext( mnit_display,  mnit_context );
 219                         }
 220                         if ( mnit_surface != EGL_NO_SURFACE) {
 221                                 eglDestroySurface( mnit_display,  mnit_surface );
 222                         }
 223                         eglTerminate( mnit_display);
 224                 }
 225                  mnit_display = EGL_NO_DISPLAY;
 226                  mnit_context = EGL_NO_CONTEXT;
 227                  mnit_surface = EGL_NO_SURFACE;
 228         `}
 229
 230         redef fun begin is extern `{
 231                 glClear(GL_COLOR_BUFFER_BIT);
 232                 glLoadIdentity();
 233         `}
 234
 235         redef fun width: Int is extern `{
 236                 return mnit_width;
 237         `}
 238         redef fun height: Int is extern `{
 239                 return mnit_height;
 240         `}
 241
 242         redef fun finish is extern `{
 243                 eglSwapBuffers( mnit_display, mnit_surface );
 244         `}
 245
 246         redef fun set_viewport( x, y, w, h ) is extern `{
 247                 glLoadIdentity();
 248                 glViewport(0,0, mnit_width, mnit_height );
 249                 glMatrixMode(GL_PROJECTION);
 250                 glLoadIdentity();
 251                 glOrthof(x, x+w, y+h, y, 0.0f, 1.0f);
 252                 glMatrixMode(GL_MODELVIEW);
 253                 glFrontFace( GL_CW );
 254         `}
 255
 256         redef fun blit(image, x, y) do native_blit(image, x.to_f, y.to_f)
 257
 258         private fun native_blit(image: Opengles1Image, x, y: Float)  `{
 259                 GLfloat texture_coord[4][2] =
 260                 {
 261                         {image->src_xo, image->src_yi},
 262                         {image->src_xi, image->src_yi},
 263                         {image->src_xo, image->src_yo},
 264                         {image->src_xi, image->src_yo}
 265                 };
 266
 267                 glLoadIdentity();
 268
 269                 glBindTexture(GL_TEXTURE_2D, image->texture);
 270
 271                 glEnableClientState(GL_VERTEX_ARRAY);
 272                 glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 273                 glTranslatef( x, y, 0.0f );
 274                 glScalef( image->width*image->scale, image->height*image->scale, 1.0f );
 275
 276                 if ( image->blended ) {
 277                         glEnable(GL_BLEND);
 278                         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 279                 }
 280
 281                 glEnable(GL_TEXTURE_2D);
 282                 glDisable(GL_DEPTH_TEST);
 283
 284                 glVertexPointer(3, GL_FLOAT, 0, mnit_opengles_vertices);
 285                 glTexCoordPointer(2, GL_FLOAT, 0, texture_coord );
 286
 287                 glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
 288
 289                 glDisableClientState(GL_VERTEX_ARRAY);
 290                 glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 291                 if ( image->blended ) glDisable(GL_BLEND);
 292                 glDisable(GL_TEXTURE_2D);
 293
 294                 if ((mnit_opengles_error_code = glGetError()) != GL_NO_ERROR) {
 295                    PRINT_ERROR("error drawing: %i", mnit_opengles_error_code);
 296                 }
 297         `}
 298
 299     redef fun blit_centered(img, x, y)
 300     do
 301                 x = x.sub(img.center_x)
 302                 y = y.sub(img.center_y)
 303                 blit(img, x, y)
 304     end
 305
 306         redef fun blit_rotated(image, x, y, angle) do native_blit_rotated(image, x.to_f, y.to_f, angle)
 307
 308         private fun native_blit_rotated(image: Opengles1Image, x, y, angle: Float) `{
 309                 GLfloat texture_coord[4][2] =
 310                 {
 311                         {image->src_xo, image->src_yi},
 312                         {image->src_xi, image->src_yi},
 313                         {image->src_xo, image->src_yo},
 314                         {image->src_xi, image->src_yo}
 315                 };
 316
 317                 glLoadIdentity();
 318
 319                 glBindTexture(GL_TEXTURE_2D, image->texture);
 320
 321                 glEnableClientState(GL_VERTEX_ARRAY);
 322                 glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 323                 glTranslatef( x, y, 0.0f );
 324                 glRotatef( angle*180.0f/3.14156f, 0, 0, 1.0f );
 325                 glTranslatef( image->width*image->scale/-2, image->height*image->scale/-2, 0.0f );
 326                 glScalef( image->width*image->scale, image->height*image->scale, 1.0f );
 327                 if ( image->blended ) {
 328                         glEnable(GL_BLEND);
 329                         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 330                 }
 331                 glEnable(GL_TEXTURE_2D);
 332                 glDisable(GL_DEPTH_TEST);
 333
 334                 glVertexPointer(3, GL_FLOAT, 0, mnit_opengles_vertices);
 335                 glTexCoordPointer(2, GL_FLOAT, 0, texture_coord );
 336
 337                 glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
 338
 339                 glDisableClientState(GL_VERTEX_ARRAY);
 340                 glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 341                 if ( image->blended ) glDisable(GL_BLEND);
 342                 glDisable(GL_TEXTURE_2D);
 343
 344                 if ((mnit_opengles_error_code = glGetError()) != GL_NO_ERROR) {
 345                    PRINT_ERROR("error drawing: %i", mnit_opengles_error_code);
 346                 }
 347         `}
 348
 349         # a = top left, b = bottom left, c = bottom right, d = top right
 350         redef fun blit_stretched(image, ax, ay, bx, by, cx, cy, dx, dy)
 351         do
 352                 native_blit_stretched(image,
 353                         ax.to_f, ay.to_f, bx.to_f, by.to_f,
 354                         cx.to_f, cy.to_f, dx.to_f, dy.to_f)
 355         end
 356
 357         private fun native_blit_stretched(image: I, ax, ay, bx, by, cx, cy, dx, dy: Float) `{
 358                 GLfloat texture_coord[4][2] =
 359                 {
 360                         {image->src_xo, image->src_yi},
 361                         {image->src_xi, image->src_yi},
 362                         {image->src_xo, image->src_yo},
 363                         {image->src_xi, image->src_yo}
 364                 };
 365
 366                 GLfloat mnit_opengles_vertices_stretched[6][3] =
 367                 {
 368                         {bx, by, 0.0f},
 369                         {cx, cy, 0.0f},
 370                         {ax, ay, 0.0f},
 371                         {dx, dy, 0.0f},
 372                 };
 373
 374                 glLoadIdentity();
 375
 376                 glBindTexture(GL_TEXTURE_2D, image->texture);
 377
 378                 glEnableClientState(GL_VERTEX_ARRAY);
 379                 glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 380
 381                 if ( image->blended ) {
 382                         glEnable(GL_BLEND);
 383                         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 384                 }
 385
 386                 glEnable(GL_TEXTURE_2D);
 387                 glDisable(GL_DEPTH_TEST);
 388
 389                 glVertexPointer(3, GL_FLOAT, 0, mnit_opengles_vertices_stretched);
 390                 glTexCoordPointer(2, GL_FLOAT, 0, texture_coord );
 391
 392                 glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
 393
 394                 glDisableClientState(GL_VERTEX_ARRAY);
 395                 glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 396                 if ( image->blended ) glDisable(GL_BLEND);
 397                 glDisable(GL_TEXTURE_2D);
 398
 399                 if ((mnit_opengles_error_code = glGetError()) != GL_NO_ERROR) {
 400                    PRINT_ERROR("error drawing: %i", mnit_opengles_error_code);
 401                 }
 402         `}
 403
 404         redef fun clear( r, g, b: Float ) is extern `{
 405                 glClearColor( r, g, b, 1.0 );
 406                 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 407         `}
 408
 409         fun clear_alpha( r, g, b, a: Float ) is extern `{
 410                 glClearColor( r, g, b, a );
 411                 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 412         `}
 413
 414         # Set the current color applied to all drawing
 415         #
 416         # require: r, g, b, a in [0.0 .. 1.0]
 417         fun color(r, g, b, a: Float) `{ glColor4f(r, g, b, a); `}
 418
 419         # Reset the current color to opaque white
 420         fun reset_color `{ glColor4f(1.0f, 1.0f, 1.0f, 1.0f); `}
 421 end
 422
 423 extern class Opengles1Image in "C" `{struct mnit_opengles_Texture *`}
 424         super Image
 425
 426     redef fun destroy is extern `{ free( recv ); `}
 427
 428     redef fun width: Int is extern `{ return recv->width; `}
 429     redef fun height: Int is extern `{ return recv->height; `}
 430
 431         fun center_x: Int `{ return recv->center_x; `}
 432         fun center_y: Int `{ return recv->center_y; `}
 433
 434     redef fun scale=( v: Float ) is extern `{
 435                 recv->scale = v;
 436                 recv->center_x = v*recv->width/2;
 437                 recv->center_y = v*recv->height/2;
 438     `}
 439     redef fun scale: Float is extern `{ return recv->scale; `}
 440
 441     redef fun blended=( v: Bool ) is extern `{ recv->blended = v; `}
 442     redef fun blended: Bool is extern `{ return recv->blended; `}
 443
 444     # inherits scale and blend from source
 445     redef fun subimage( x, y, w, h: Int ): Image is extern import Opengles1Image.as( Image ) `{
 446                 struct mnit_opengles_Texture* image =
 447                         malloc( sizeof( struct mnit_opengles_Texture ) );
 448
 449                 image->texture = recv->texture;
 450                 image->width = w;
 451                 image->height = h;
 452                 image->center_x = recv->scale*w/2;
 453                 image->center_y = recv->scale*h/2;
 454                 image->scale = recv->scale;
 455                 image->blended = recv->blended;
 456
 457                 image->src_xo = ((float)x)/recv->width;
 458                 image->src_yo = ((float)y)/recv->height;
 459                 image->src_xi = ((float)x+w)/recv->width;
 460                 image->src_yi = ((float)y+h)/recv->height;
 461
 462                 return Opengles1Image_as_Image( image );
 463     `}
 464 end